For example, in the 19th century, the Sun appeared to be no more than 20 million years old, but the Earth appeared to be no less than 300 million years ( resolved by the discovery of nuclear fusion and radioactivity, and the theory of quantum mechanics ); or current attempts to resolve theoretical differences between quantum mechanics and general relativity.

The history of nuclear physics as a discipline distinct from atomic physics starts with the discovery of radioactivity by Henri Becquerel in 1896, while investigating phosphorescence in uranium salts.

While the work on radioactivity by Becquerel and Marie Curie predates this, an explanation of the source of the energy of radioactivity would have to wait for the discovery that the nucleus itself was composed of smaller constituents, the nucleons.

At about the same time as this important discovery, he observed that when " p-particles ", ejected from radio-active substances, impinge upon zinc sulfide, each impact is accompanied by a minute scintillation, an observation which forms the basis of one of the most useful methods in the technique of radioactivity.

Before the discovery of radioactivity, uranium was primarily used in small amounts for yellow glass and pottery glazes, such as uranium glass and in Fiestaware.

It is expected that some continual improvement of experimental sensitivity will allow discovery of very mild radioactivity ( instability ) of some isotopes that are considered to be stable today.

In 1934, he participated in the discovery of the artificial radioactivity of fluorine and aluminium which would be critical in the development of the atomic bomb.

After the discovery of radioactivity by Henri Becquerel in 1896, it was generally believed that atmospheric electricity, ionization of the air, was caused only by radiation from radioactive elements in the ground or the radioactive gases or isotopes of radon they produce.

Becquerel's discovery of radioactivity is a famous example of serendipity, of how chance favors the prepared mind.

There followed a period of intense research in radioactivity, including the discovery of additional radioactive elements thorium, polonium and radium, the latter two by Becquerel's doctoral student Marie Curie and her husband Pierre Curie.

In 1903, Becquerel shared the Nobel Prize in Physics with Pierre and Marie Curie " in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity ".

Jointly with her husband, Joliot-Curie was awarded the Nobel Prize for chemistry in 1935 for their discovery of artificial radioactivity.

Brachytherapy dates back to 1901 ( shortly after the discovery of radioactivity by Becquerel in 1896 ) when Pierre Curie suggested to Henri-Alexandre Danlos that a radioactive source could be inserted into a tumour.

The study of phosphorescent materials led to the discovery of radioactivity in 1896.

The discovery of radioactivity and the development of a variety of radiometric dating techniques in the first half of the 20th century provided a means of deriving absolute versus relative ages of geologic history.

The discovery of x-rays and radioactivity in the last years of the 19th century led to an increase in the popularity of this family of weapons, with numerous examples in the early twentieth century, such as the disintegrator rays of George Griffith's future war novel The Lord of Labour ( 1911 ).

With a scholarship from the University of Birmingham he pursued research in physics following the discovery of X-rays and radioactivity in the mid-1890s.

It would take further advances in geology and the discovery of radioactivity that showed that the sun was in fact heated by nuclear fusion that demonstrated the present estimated 4. 567 billion years, or ~ 700, 000 times Ussher's value.

" The Education mentions the recent discovery of x-rays and radioactivity, and shows a familiarity with radio waves in his citation of Marconi and Branly.

After the discovery by Ernest Rutherford and Niels Bohr of the atomic structure in 1912, and by Marie and Pierre Curie of radioactivity, scientists had to change their viewpoint on the nature of matter.

The formal discovery of the element was made in 1895 by two Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet, who found helium emanating from the uranium ore cleveite.

Chemical separation of the new formed elements from the uranium yielded material with low half-life, and, therefore, Fermi announced the discovery of a new element in 1934, though this was soon found to be mistaken.

The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the planet Uranus.

The discovery and isolation of radium in uranium ore ( pitchblende ) by Marie Curie sparked the development of uranium mining to extract the radium, which was used to make glow-in-the-dark paints for clock and aircraft dials.

In early 1896, in the wave of excitement following Wilhelm Conrad Röntgen's discovery of X-rays the previous fall, Becquerel thought that phosphorescent materials, such as some uranium salts, might emit penetrating X-ray-like radiation when illuminated by bright sunlight.

After the discovery of uranium in 1958 near Tordilla Hill, ten miles west of Falls City, uranium mining and milling developed.

The city was established as a planned community for the mining industry in 1955 after the discovery of uranium in the area, and named after the small lake on its northern edge.

She was launched in 1964 and named in honour of Otto Hahn, the German chemist and Nobel prizewinner, who was credited with the discovery of nuclear fission of uranium in 1938.

For more details of the original discovery of nuclear fission see the work of Otto Hahn. Meitner L, Frisch OR ( 1939 ) Disintegration of uranium by neutrons: a new type of nuclear reaction Nature The nuclear fuel cycle The chemistry associated with any part of the nuclear fuel cycle, including nuclear reprocessing.

The subsequent discovery of other rich and profitable veins of gold, as well as uranium, eventually led to the creation of the largest urban conglomeration in sub-Saharan Africa.

As demonstrated above, Wells did have some knowledge of atomic physics, and William Ramsay, Ernest Rutherford, and Frederick Soddy's discovery of the disintegration of uranium ; Soddy's book Wealth, Virtual Wealth and Debt praises The World Set Free.

Kamisaibara is the site of the first discovery of an outcropping of uranium ore within Japan.

The discovery of uranium at Mary Kathleen brought wealth to the community in the 1950s.

Although its life was short-lived, its significance was that it led to the discovery of the entire Blind River-Elliot Lake uranium mining camp.

The discovery of uranium at Rössing, outside the town, led to the development of the world's largest opencast uranium mine.

Founded in 1969 following the discovery of uranium, it has grown around the mining industry, developed by the French government.

Once the online Web-based portion of the project was completed: the " winner " having taken a trip following Tulse Luper's travels ( and often imprisonment ) during his first writings about the discovery of uranium in Moab, Utah in 1928 to his mysterious disappearance at the fall of the Berlin Wall in 1989.

Arthur Jeffrey Dempster ( August 14, 1886-March 11, 1950 ) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery of the uranium isotope < sup > 235 </ sup > U.

This discovery, made at the Observatoire de Haute-Provence, ushered in the modern era of exoplanetary discovery.

Federico Faggin developed the first micro-chip and micro-processor ; Robert Gallo led research that identified a cancer-causing virus, and also the AIDS virus ; Anthony Fauci conducted significant research that led to the discovery of the AIDS virus ; Riccardo Giacconi developed the X-ray telecope ; and Enrico Fermi ushered in the nuclear age.

The discovery of the Leduc No. 1 oil well in 1946 and major reserves in the Turner Valley area southwest of the city ushered in a period of growth and prosperity.

Thus Fred Griffith's findings are still relevant to epidemiology, pathology, and clinical medicine, and Fred Griffith's discovery ushered in modern microbiology, modern genetics, and molecular biology.

Prontosil's discovery ushered in the era of antibiotics and had a profound impact on pharmaceutical research, drug laws, and medical history.